What is porphyry molybdenum?
Arc-related porphyry molybdenum deposits are a substantial resource for molybdenum metal and may have anomalous concentrations of tungsten. The deposits contain low-grade ore (0.03-0.22 percent molybdenum) as molybdenite, but are large-tonnage, making them amenable to bulk mining open-pit techniques.
Is porphyry an iron ore?
These iron oxide-apatite deposits, which are designated as porphyry iron deposits in the Chinese literature (Ningwu Research Group 1978), are temporally, spatially, and genetically associated with subvolcanic porphyritic gabbro-diorite and/or pyroxene diorite intrusions. …
What is porphyry copper systems?
Porphyry Cu systems are defined as large volumes (10->100 km3) of hydrothermally altered rock centered on porphyry Cu stocks that may also contain skarn, carbonate-replacement, sediment-hosted, and high- and intermediate-sulfidation epithermal base and precious metal mineralization.
Is porphyry Cu deposit a hydrothermal deposit?
Porphyry copper deposits are copper ore bodies that are formed from hydrothermal fluids that originate from a voluminous magma chamber several kilometers below the deposit itself. Predating or associated with those fluids are vertical dikes of porphyritic intrusive rocks from which this deposit type derives its name.
What is porphyry used for?
Porphyry is prized for its great compressive strength and exceptional durability. For this reason it is now most commonly used as a paving stone.
What minerals are in porphyry?
Porphyry ore deposits are the Earth’s major resources of copper, molybdenum, and rhenium (Sillitoe, 2010) and also provide significant amounts of gold, silver, and other metals. Mineralization styles include stockwork veins, hydrothermal breccias, and wall-rock replacements.
What kind of rock is porphyry?
igneous rock
Porphyry is a diversity of igneous rock consisting of large-grained crystal such as quartz and feldspar scattered in a fine-grained groundmass. The groundmass is composed of indistinguishable crystals (aphanites as in basalt) or easily distinguishable crystals (phanerites as in granite).
Where is porphyry copper found?
Large porphyry copper deposits are worked in the southwestern United States (where molybdenum is produced as a by-product), the Solomon Islands, Canada, Peru, Chile, Mexico, and other parts of the world.
Where does porphyry come from?
The word “porphyry” comes from the Latin word for purple, which was the color of nobility to the Romans. Porphyry was Imperial Rome’s most prestigious stone for columns, vases, alters, busts and other objects.
What type of stone is porphyry?
Porphyry is a diversity of igneous rock consisting of large-grained crystal such as quartz and feldspar scattered in a fine-grained groundmass. The groundmass is composed of indistinguishable crystals (aphanites as in basalt) or easily distinguishable crystals (phanerites as in granite).
Is porphyry A granite?
In terms of its mineral content this is a typical granite, consisting of pink potassium feldspar, cream sodium feldspar (plagioclase), grey quartz and black biotite mica.